[Badger]

I think a very interesting social phenomenon was glossed over here.
The fact that she asked your buddy out and they are exclusive but, they are still only kind of going out. Also pointed out- she's listed as single on facebook. Does anyone else find facebook being the metric of a relationship to be amusing. Not singling out your case here gg. It's rampant.

My take on the situation since I'm already replying:
I'm not going to judge you as a friend because I don't know you- but the manner in which you phrased things, the details you included and the fact that this was too big of an issue to just ask your buddy "Hey, cool if I go to this?" leads me to believe you may not have intent but you at least have interest on some level.